Stratoblaster
Fractal Fanatic
I gotta be honest here - 5 seconds with ANY of the G3'd Marshalls REALLY shines and is immediately discernable as better than 17.04.
Since I generally play NMV amps (and I crank the Master in MV amps until things 'fall apart' and back off a bit) the firmware differences are usually very apparent to me. A lot of the feel is dependent on the power amp working hard and having the speaker interact with the output section.